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"was this on the plate on the compressor."
If it was on the compressor, that's what it uses.
I tried a couple of web searches on refrigerant numbers, and found that three of the top four web hits on Google (searching by 2 refrigerant numbers) WERE MALWARE SITES THAT WILL INFECT YOUR COMPUTER WITH MULTIPLE WORMS AND PUT UP A FAKE SECURITY WARNING AND CLEANING PAGE.
Why seemingly innocent web sites about AC should be pumped full of malware, go figure, but if anyone else out there is looking--make Real Damn Sure you've got active anti-malware software loaded. The predators are out there hunting in this field, right now, today.
The lists I have don't show 134b, they show 143a and 134a, but there are hundreds of refrigerant gasses out there and very few direct if any substitutes that aren't problematic. What any manufacturer is using will vary over time, as regulations and supplies change.
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